Like Alexander and Bryan, I'd recommend putting your current optics into a truss dob. Have a look at Tim Nott's 10" project using GSO optics - this scope is sooo portable and easy and could be easily adapted to 12". I think Tim just drew up the plans and got a business to cut the timber and then he glued it together.
http://www.iceinspace.com.au/forum/s...ad.php?t=38956
Of course there are heaps of designs and Bryan's suggestion of getting Peter Read to do it is also great. There should be no need to sacrifice aperture to get portability. My 16" tridob is far more portable than my 12" GSO was.